Put coins into, as a meter (3)
I believe the answer is:
fed
'put coins into as a meter' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for fed that I've seen before include "Nourished" , "American cop" , "Dished up food" , "Gave food to (someone)" , "Given sustenance" .)